Mining-drill.



No. 831,056. PATENTBD SEPT. 18, 1906.

B. v. GILMOIIE.

MINING DRILL.

APPLICATION FILED PIB. 14, 1906.

w WA wk x/ UNITE earns ATENT Grit?.

MINING-@HILL Specification of Letters Patent.

Patented Sept. 18, 1906.,

Application tiled February 14, 1906. Serial No. 3l,109.

To all whom. t may concern:

VBe it known that I, BENJAMIN V. GILMORE, a citizen of the United States, residing at Red House Shoals, in-the county-of Putnam and State of West Vir inia,.,have invented certain new and usefu Improvements in Mining- Drills, of which thefollowing is a specification.

This invention relates to borin -tools for mining, operations, being design-e most especially for cutting into coal to prepare openings for reception of theexplosive.

The invention consists of a tool of novel formation of the type comprisin a hollow body provided upon i ts exterior with a spiral clearer to carry off the cuttings and having openings in its side for escape of the inner cuttings and provided with an exterior cutter to insure separation of the core at or near its base prior to removal of the tool after the bore has reached the required de th.

An essential feature of t e inventionV -resides in the peculiar arrangement of the core and cutter with reference to the b ody of the tool and in the mounting for said cutter and in the means for preventing displacement of the mounting.

The invention further resides in the novelstructure of the tool, whereby its efficiency is enhanced and the operation of the boring fa-. cilitated, the toothed portion being. reino vable, so as to be readil replaced at a nominal cost when dull or ot erwise rendered unfit for further effective service.

The inventionv also consists of the novel features which hereinafter will be more particularly set forth, illustrated, and finally claimed.

In the accompanying drawings, formingA part of the specification, Fi ure 1 is a perspective view of the end portion of a tool ernbodying the invention provided with the cutting-teeth. Fig. 2 is a central longitudinal section of the cutting-end portion of the tool. Fig. 3 is a transverse section on the line c: a: of Fi .2.

orresponding and like parts are referredv to in the following description and indicatedin all the views of the drawings by the same reference characters.

The body 1 of the tool is hollow or tubular and is thickened near its cutting end, as shown at 2, and is provided upon its exterior with a spiral flight or clearer 3, preferably of a width corresponding to the extra thickness 2 at ornear the cutting endof said body. The Hight 3 may consist of a ribbed ange or like part either formed with the body 1 as a par thereof or Welded, brazed or otherwise secured thereto as a separatenpart. The purpose ofthe flight or clearer 3 is tocarry off cuttin s resulting from the operation of the tool w en in service. A series of openings 5 are formed inthe body 1 between the flight or clearer 3 and provides an escape for the inner cuttings, thereby pre venting binding between the core of the inner Walls of the tool when the latter is performing work. The o enings 5 are located between the volutes of t e-light, so as notto interfere with the latter in any manner.

The cutters 6 are' swaged, so as to project beyond the inner and outer walls of the thickened end ortion of the tool, and thereby provide amp e clearance therefor. The cutters 6 are in the form `of teeth and form part ofa ring 7, which is fitted to the cutter end of the tool and tempered so as to resist the dulling action of the mineral while the tool is infoperation. connected with tlie body 1 by means of a screw-threaded joint 8, and for this pur ose the cutter end of the tool is reduced an exteriorly threaded, and the attaching end of the ring 7 is enlarged and interiorly threaded to match the reduced threaded end of the body 1, as shown most clearly in Fig.' 2, the thread being such as to re vent loosening of the ring when rotating t e tool and advancing the saine vinto the mineral in the mining operation.

A cutter 9 is located near the cutting end of the tool and projects from the inner Wall thereof so as to cut into the core formed by the tool. The cutter 9 preferably consists of a wheel or disk and is arranged in an opening or recess 1() formed in the thickened portion 2 and is preferably set angling, so as to correspond approximately with the pitch of the ight or clearer 3. The rotary cutter 9 is mounted upon a pin 11, which is let into?` an opening 12, formed in the thickened portion 2, said pin being supportedat its ends upon opposite sides of the opening or recess 1() and he d in place by the cutter-ring 7, as indicated most clearly in Fig. 2.

The tool is adapted to be rotated in any manner well understood in mining operations and being of hollow or tubular forin makes a cylindrical cut, the core entering the body 1. The cutter 9 materially assists in the feed or advancement of the tool by reason of its cutting into the core in a spiral direction,

It is preferred to have the ring 7 IOO IIO

the cuttings formed thereby finding a ready l 2. A hollow or. tubular mining-'tool proescape through the openings 5 to the exterior ofthe tool, so as to be carried off by means of the clearer 3. When the cutter has reached te reuisite depth, the tool is held from furt er a v lar groove or cut at the inner end of the core,

thereby severing said core or admitting of the same being readily broken oi when withdrawing the tool, thereby providing an opening for-the eption of cartridge or other explosive employed for loosening and dislodging the mineral or other substance.

Having thus described the invention, what is claimed as new is y l1. A hollow or tubular minin -tooll a cut vancernent, thereby forming an annu*-A vid ed with a thickened end ha ving a reduced and threaded terminal portion and provided with an exterior spirally-arranged clearer and having openings in its sides Vbetween the volutes of said clearer, a rotary cutter let into an ,opening or recess in the thickened end portion of the body and projected into the space of the body from its inner Wall, a pin support- 3o ing the rotary cutter and let into an opening formed in the thickened rend portion of the tool, anda ring provided With'teeth and 'connected by a screw-threaded joint provided with the reduced terminal -portion of the toolbody.

In testimony whereof I aflix my signature in presence of two witnesses.

BENJAMN V. GILMORE. [11. s.) `Witnesses:

J. D. YOAKLEY, V. B, HILLYRD. 

